Sagi Menahem - Independent Software Developer
Founder of AfterTech. I build production e-commerce, business systems and AI features — from requirements to launch and ongoing maintenance.
ABOUT
I am an independent software developer and the founder of AfterTech. I build production e-commerce platforms and admin tooling for paying clients, and develop LLM features such as a Hebrew-language support agent with hybrid vector and full-text retrieval and re-ranking. From real-time systems in Java to Hebrew RTL storefronts on Next.js and Supabase, my work includes payment integrations, custom CMS tools and production monitoring. I work directly with clients throughout development and ongoing maintenance. I am completing a B.Sc. in Computer Science at The Open University of Israel. This portfolio brings together my client, personal and academic work.
WORK
A real-time collaborative whiteboard platform enabling teams to ideate together, no matter where they are.
Real-Time Collaboration
Draw, brainstorm, and create together in real-time. Every stroke syncs across all connected users over low-latency WebSocket delivery, creating a seamless collaborative experience.
Enterprise-Grade Architecture
Built with Spring Boot and STOMP protocol over ActiveMQ Artemis for reliable message delivery. Features offline resilience with automatic reconnection, message queuing, and optimistic UI updates.
Production-Ready Stack
Dockerized deployment with PostgreSQL, Nginx reverse proxy, and automated SSL. Features JWT authentication, Google OAuth2, email verification, and role-based permissions.
Other Projects
AfterTech Portal
A production client billing portal with a Hebrew-first RAG support agent, running the client side of the AfterTech agency. Retrieval fuses pgvector similarity with Postgres full-text ranking through Reciprocal Rank Fusion and an LLM reranker, so the agent answers only from retrieved knowledge and says so when it has none. One agent brain serves both a WhatsApp business line and a chat widget embedded cross-origin in the marketing site, with hosted-page payments and server-side idempotency on every money operation.
FBT Israel
A production Hebrew RTL + English e-commerce storefront for the official Israeli importer of FBT Elettronica, an Italian professional audio brand since 1963. Real Tranzila card payments with independent server-side re-verification before an order is ever marked paid, plus a custom admin CMS for the full catalog.
Synthetix
A mobile-first SaaS for running weekly pickup football nights, from attendance to a saved final score. Balanced squads are generated from private admin fairness ratings that never reach the client, with drag-and-drop squad swaps mid-game and a fully bilingual Hebrew/English UI.
AfterTech
A conversion-optimized web agency landing page for Israeli SMEs with a scroll-morph hero, Three.js particle background, dual contact flows, and an integrated accessibility menu. Built RTL-first as a fully static Next.js export with structured data for a perfect 100/100 SEO score.
Artist Portfolio
A full-stack site for an artist, rewritten from the ground up. The client edits every section himself through a CMS spanning eleven content areas; leads arrive with UTM attribution and reach him over WhatsApp; and the analytics count visitors without storing any PII — a visitor is a salted, day-rotating hash rather than an IP or a cookie. Hebrew, RTL-first, with an accessibility menu and a wall preview that shows a painting at true scale in a room.
Insurance Agent Demo
A demo landing page for an independent insurance agent with Hebrew RTL support, lead generation forms, and a comprehensive accessibility menu. Optimized for conversion with trust indicators and a multi-step consultation process.
System Assembler
A complex system programming project implementing a two-pass assembler in C. Handles dynamic memory allocation, symbol table management, and binary code generation for a custom CPU architecture.
AfterTech Portal
A production client billing portal with a Hebrew-first RAG support agent, running the client side of the AfterTech agency. Retrieval fuses pgvector similarity with Postgres full-text ranking through Reciprocal Rank Fusion and an LLM reranker, so the agent answers only from retrieved knowledge and says so when it has none. One agent brain serves both a WhatsApp business line and a chat widget embedded cross-origin in the marketing site, with hosted-page payments and server-side idempotency on every money operation.
FBT Israel
A production Hebrew RTL + English e-commerce storefront for the official Israeli importer of FBT Elettronica, an Italian professional audio brand since 1963. Real Tranzila card payments with independent server-side re-verification before an order is ever marked paid, plus a custom admin CMS for the full catalog.
Synthetix
A mobile-first SaaS for running weekly pickup football nights, from attendance to a saved final score. Balanced squads are generated from private admin fairness ratings that never reach the client, with drag-and-drop squad swaps mid-game and a fully bilingual Hebrew/English UI.
AfterTech
A conversion-optimized web agency landing page for Israeli SMEs with a scroll-morph hero, Three.js particle background, dual contact flows, and an integrated accessibility menu. Built RTL-first as a fully static Next.js export with structured data for a perfect 100/100 SEO score.
Artist Portfolio
A full-stack site for an artist, rewritten from the ground up. The client edits every section himself through a CMS spanning eleven content areas; leads arrive with UTM attribution and reach him over WhatsApp; and the analytics count visitors without storing any PII — a visitor is a salted, day-rotating hash rather than an IP or a cookie. Hebrew, RTL-first, with an accessibility menu and a wall preview that shows a painting at true scale in a room.
Insurance Agent Demo
A demo landing page for an independent insurance agent with Hebrew RTL support, lead generation forms, and a comprehensive accessibility menu. Optimized for conversion with trust indicators and a multi-step consultation process.
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SKILLS
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